How to Make It
Preheat the oven to 350° and preheat a grill pan. In a small bowl, combine the rosemary, sage and thyme with 2 tablespoons each of salt and pepper. Rub the steak with 2 tablespoons of the oil and then rub with the herb mixture. Grill the steak over moderately high heat until lightly charred all over, about 10 minutes. Transfer to a small roasting pan and roast for about 40 minutes, or until an instant-read thermometer inserted into the thickest spot registers 120°. Let rest for 10 minutes before slicing.
Meanwhile, in a large, deep skillet, heat the remaining 1/4 cup of oil until smoking. Add the garlic and cook over high heat until lightly browned, about 20 seconds. Add the spinach in large handfuls and cook, tossing, until wilted, 5 minutes. Season with salt and pepper and stir in the lemon juice. Serve the spinach with the steak.